c#拓展方法将datatable转换成实体

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Web.Mvc;
using System.Configuration;

namespace BitCar.Finance.CC.Common
{
    public static class Extensions
    {
        /// 

        /// DataTable 转换为 List
        /// 
        /// 
        /// 
        /// 
        public static List ToList(this DataTable dt) where T : class,new()
        {
            Type t = typeof(T);
            PropertyInfo[] propertys = t.GetProperties();
            List lst = new List();
            string typeName = string.Empty;

            foreach (DataRow dr in dt.Rows)
            {
                T entity = new T();
                foreach (PropertyInfo pi in propertys)
                {
                    typeName = pi.Name;
                    if (dt.Columns.Contains(typeName))
                    {
                        if (!pi.CanWrite) continue;
                        object value = dr[typeName];
                        if (value == DBNull.Value) continue;
                        if (pi.PropertyType == typeof(string))
                        {
                            pi.SetValue(entity, value.ToString(), null);
                        }
                        else if (pi.PropertyType == typeof(int) || pi.PropertyType == typeof(int?))
                        {
                            pi.SetValue(entity, int.Parse(value.ToString()), null);
                        }
                        else if (pi.PropertyType == typeof(DateTime?) || pi.PropertyType == typeof(DateTime))
                        {
                            pi.SetValue(entity, DateTime.Parse(value.ToString()), null);
                        }
                        else if (pi.PropertyType == typeof(float) || pi.PropertyType == typeof(float?))
                        {
                            pi.SetValue(entity, float.Parse(value.ToString()), null);
                        }
                        else if (pi.PropertyType == typeof(double) || pi.PropertyType == typeof(double?))
                        {
                            pi.SetValue(entity, double.Parse(value.ToString()), null);
                        }
                        else if (pi.PropertyType == typeof(byte) || pi.PropertyType == typeof(byte?))
                        {
                            pi.SetValue(entity, byte.Parse(value.ToString()), null);
                        }
                        else if (pi.PropertyType == typeof(Int16) || pi.PropertyType == typeof(Int16?))
                        {
                            pi.SetValue(entity, Int16.Parse(value.ToString()), null);
                        }
                        else
                        {
                            pi.SetValue(entity, value, null);
                        }
                    }
                }
                lst.Add(entity);
            }
            return lst;
        } 
    }
}